Malicious PDF — malware analysis report

Static analysis result for SHA-256 e89e6b816b0eb311…

MALICIOUS

PDF

85.3 KB Created: 2021-07-02 11:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a69a08b74d11168e351311bc79810e15 SHA-1: 2ddf1dede7161a722f9dd13658cc9be1aa84a3ec SHA-256: e89e6b816b0eb3117cd937b7b47e0b50471f42db1116ad0c33b8f3a69eb31f7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various domains, many of which appear to be compromised WordPress sites hosting PDF files. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using link farms on potentially compromised infrastructure to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/d5216d725f058a4be6a582131ecf0c4e/39713617409.pdf
    • http://taikenplan.jp/ckfinder/userfiles/files/11597605978.pdf
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085f0f9e3aea---99187092349.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9d2eb3ee6---mibavigepezofas.pdf
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609ae9e451276---buvosepadariwavi.pdf
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758c0a34aec---sidulubawijux.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/678o0qsv2fqji9ov50ebnufb77/12861205272.pdf
    • http://www.look4job.gr/images/_user_na/file/71294711384.pdf
    • https://alutat.com/data/file/raridezu.pdf
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/843833f9d2a7cc0b8322fd9750d63ac3/13913802908.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8e3191487---raponixiwefuti.pdf
    • http://goref.ru/files/file/896274612.pdf
    • http://historia-bfured.hu/userfiles/file/pigazupepudimimit.pdf
    • http://akkoryazilim.com/userfiles/file/kufodir.pdf
    • http://groupkaishan.com/d/files/53258964187.pdf
    • http://stroisvias.ru/userfiles/file/7445137984.pdf
    • http://acpiindia.com/userfiles/file/fopazo.pdf
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/228e47864c08a3188d8c195a24231e58/balesowotarizazobije.pdf
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/7gmpitotl8nv3snj0q4nam5sh5/16025481967.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a095496be64---tolamorumoguvozutigevatix.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc4dd68cc2---22186889126.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/0f752549d2d9949ad4735f19feb53686/gepido.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df38065628---30978848945.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=through+and+through+laceration
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e9a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A4 16792 bytes
font_01_sfnt_off000101bb.bin
bb26e261eeb9a473e9448d944f06112e55f5fc147c109ffb4b4f9d39247012d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x101BB 10544 bytes
font_02_sfnt_off00011975.bin
2c891ea4f46650b5222ac8c11aec93ee377de570abaecc2dcd8b5e025cd4d3b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x11975 17492 bytes